ppl (or one of its subpacakges) has multiarch conflicts when installed for both i386 and x86_64 in the Fedora development tree. For help in resolving them, see http://fedoraproject.org/wiki/PackagingDrafts/MultilibTricks.
file /usr/include/ppl.hh from install of ppl-devel-0.9-16.fc8 conflicts with file from package ppl-devel-0.9-16.fc8
(Note that this is an automated bug filing.)
It would be nice to have these bugs fixed by the beta of Fedora 9.